JP2017200714A - Cutting device of rubber material and cutting method of the rubber material - Google Patents

Abstract

An object of the present invention is to provide a rubber material cutting device and a cutting method which can cut in a short time without roughening a cut surface. A rubber material cutting device for cutting a rubber material while moving a cutter blade, the rubber material being moved while simultaneously moving a cutter blade having a blade edge directed to the rubber material in a width direction and a thickness direction of the rubber material. A rubber material cutting device equipped with a cutter moving mechanism that cuts material. The cutter moving mechanism includes a traversing mechanism that moves the cutter blade in the width direction of the rubber material, and an elevating mechanism that moves the cutter blade in the thickness direction of the rubber material, and simultaneously operates the elevating mechanism and the traversing mechanism. A rubber material cutting device configured to cut the rubber material by causing the device to cut. [Selection diagram] Fig. 1

Description

  The present invention relates to a rubber material cutting device used for manufacturing a pneumatic tire and a rubber material cutting method using the rubber material cutting device.

  In the production of a pneumatic tire, a long rubber material is cut into a predetermined length, the cut rubber material is wound around a cylindrical molding drum, and the cut surfaces are joined to each other ( For example, Patent Document 1).

  FIG. 4 is a perspective view for explaining an example of a conventional cutting method. In the cutting method shown in FIG. 4, the rubber material W is cut by moving the heated cutter blade C1 in the width direction of the rubber material W (the direction of the arrow in FIG. 4). In the case of this method, it takes time to cross the rubber material W, and the productivity of the tire is deteriorated. Further, the temperature of the cutter blade C1 is lowered during cutting, and the cut surface may be roughened.

  For cutting a long rubber material, a method as shown in FIG. 5 is also performed. FIG. 5 is a perspective view for explaining another example of the conventional cutting method. In the cutting method shown in FIG. 5, the cutter blade C2 whose blade edge is directed downward is arranged above the rubber material W, and is moved and cut in the thickness direction of the rubber material W (the direction of the arrow in FIG. 5). In the case of this method, the rubber material can be cut in a shorter time than the method shown in FIG.

JP 2012-171274 A

  However, when the cutting method shown in FIG. 5 is used, there is a high possibility that the cut surface of the rubber material after cutting is rough due to friction between the cutter blade C2 and the rubber material W. As described above, in any of the conventional techniques, it is difficult to satisfy both the shortening of the time required for cutting and the prevention of roughening of the cut surface, regardless of which cutting method is used.

  Accordingly, an object of the present invention is to provide a rubber material cutting device and a cutting method capable of shortening the time required for cutting and preventing roughening of the cut surface.

The invention described in claim 1
A rubber material cutting device for cutting rubber material while moving a cutter blade,
A rubber material cut comprising a cutter moving mechanism for cutting the rubber material while simultaneously moving the cutter blade whose blade edge is directed to the rubber material in the width direction and the thickness direction of the rubber material. Device.

The invention described in claim 2
The cutter moving mechanism is
A traversing mechanism for moving the cutter blade in the width direction of the rubber material;
An elevating mechanism for moving the cutter blade in the thickness direction of the rubber material,
2. The rubber material cutting device according to claim 1, wherein the rubber material is cut by operating the traversing mechanism and the elevating mechanism at the same time.

The invention according to claim 3
The rubber material cutting device according to claim 2, wherein the cutter blade is attached to a transverse axis of the transverse mechanism.

The invention according to claim 4
The rubber material cutting device according to claim 2, wherein the cutter blade is attached to a lifting shaft of the lifting mechanism.

The invention described in claim 5
The rubber material cut according to any one of claims 1 to 4, wherein the cutter blade is inclined so that a cut surface of the rubber material after the cutting has an acute angle with respect to a thickness direction. Device.

The invention described in claim 6
The lifting shaft of the lifting mechanism is inclined with respect to the thickness direction of the rubber material,
5. The structure according to claim 2, wherein the cutter blade is moved so that a cut surface of the rubber material after the cutting has an acute angle with respect to the thickness direction. The rubber material cutting device described in 1. above.

The invention described in claim 7
The rubber material cutting device according to any one of claims 1 to 6, wherein a heater for heating a blade edge of the cutter blade is attached to the cutter moving mechanism.

The invention according to claim 8 provides:
A heater moving mechanism for moving the heater close to or away from the blade edge of the cutter blade;
The heater moving mechanism is configured to heat the blade edge directly by bringing the heater close to the blade edge before cutting the rubber material, and to separate the heater from the blade edge when the rubber material is cut. The rubber material cutting device according to claim 7.

The invention according to claim 9 is:
9. The rubber material cutting device according to claim 8, wherein the heater moving mechanism is configured to bring the heater close to a cutting edge of the cutter blade up to a distance of 0 to 10 mm.

The invention according to claim 10 is:
A rubber material cutting method for cutting a rubber material using the rubber material cutting device according to any one of claims 1 to 9,
A rubber material cutting method, wherein the rubber material is cut while simultaneously moving the cutter blade whose blade edge faces the rubber material in the width direction and the thickness direction of the rubber material.

The invention according to claim 11
The rubber material cutting method according to claim 10, wherein the rubber material is cut by lowering the cutter blade in the thickness direction while traversing in one direction along the width direction of the rubber material. is there.

  According to the present invention, it is possible to provide a rubber material cutting device and a cutting method capable of shortening the time required for cutting and preventing roughening of the cut surface.

It is a front view which shows the cutting device of the rubber material which concerns on one embodiment of this invention. It is a front view which shows the cutting apparatus of the rubber material which concerns on other embodiment of this invention. It is a side view explaining the heater of the cutting apparatus of the rubber material which concerns on other embodiment of this invention. It is a perspective view explaining an example of the conventional cutting method. It is a perspective view explaining the other example of the conventional cutting method.

  Hereinafter, the present invention will be described with reference to the drawings based on embodiments.

1. Rubber Material Cutting Device According to the Present Embodiment FIG. 1 is a front view showing a rubber material cutting device (hereinafter also simply referred to as “cut device”) according to the present embodiment. The cutting device according to the present embodiment includes a cutter blade C and a cutter moving mechanism 1 that moves the cutter blade C.

(1) Cutter Blade As shown in FIG. 1, the cutting device according to the present embodiment has a cutter blade C whose blade edge is directed downward, similarly to the cutting device used in the conventional cutting method shown in FIG. 5. It is disposed above a rubber material (not shown).

(2) Cutter moving mechanism The cutting device according to the present embodiment cuts the rubber material while simultaneously moving the cutter blade C in the width direction (lateral direction) and the thickness direction (longitudinal direction) of the rubber material. The point provided with the cutter moving mechanism 1 is different from the conventional one.

  Specifically, the cutter moving mechanism 1 includes a traversing mechanism 2 that moves the cutter blade C in the horizontal direction and an elevating mechanism 3 that moves the cutter blade C in the vertical direction.

  The traversing mechanism 2 includes a cutter bracket 2a that supports the cutter blade C, a traverse shaft 2b that guides the cutter bracket 2a in the lateral direction, and a lateral feed motor (not shown) that moves the cutter bracket 2a along the traverse axis 2b. The cutter blade C is moved in the lateral direction by operating the transverse feed motor.

  The elevating mechanism 3 includes a support member 3a that slidably supports the traverse shaft 2b, an elevating shaft 3b that guides the support member 3a in the vertical direction, and an elevating motor for moving the traverse shaft 2b along the elevating shaft 3b ( The cutter blade C supported by the transverse shaft 2b is moved in the vertical direction via the cutter bracket 2a by operating the lifting motor.

  The cutting device according to the present embodiment cuts the rubber material while simultaneously moving the cutter blade C in the two axial directions of the horizontal direction and the vertical direction by operating the traversing mechanism 2 and the lifting mechanism 3 as described above. To do. As a result, the time required for cutting can be shortened and the roughened cut surface can be prevented.

  That is, according to the present embodiment, the rubber material W is cut in the vertical direction in the same manner as the cutting method shown in FIG. 5, and therefore the cutting time is shortened compared with the method of cutting in the horizontal direction as shown in FIG. can do.

  Since the cutter blade C is moved in the horizontal direction at the same time as the vertical direction, the cutting can be performed while pulling the cutter blade instead of pushing out the rubber material as in the conventional cutting method shown in FIG. Thereby, the friction between the cutter blade C and the rubber material can be reduced, and the cut surface of the rubber material after cutting can be prevented from being rough.

  In the present embodiment, the cutter blade is moved in the vertical direction (the thickness direction of the rubber material), but it is more preferable that the lifting shaft 3b is tilted with respect to the vertical direction. As a result, the cut surface of the rubber material after cutting becomes an acute angle with respect to the thickness direction, so that the convex portion generated in the joint portion when the cut surfaces are joined together is reduced, and a high-quality pneumatic tire is manufactured. be able to.

  In general, if the cutter blade is tilted so that the cut surface of the rubber material becomes an acute angle with respect to the thickness direction, the contact area between the rubber material and the cutter blade increases, and the friction increases and the cut surface is likely to be rough. Become. However, according to the cutting device according to the present embodiment, since the friction between the cutter blade C and the rubber material is greatly reduced, even if the friction increases slightly by tilting the cutter blade, the cut surface becomes rough. There is no.

2. Rubber Material Cutting Device According to Other Embodiment (1) Other Examples of Cutter Moving Mechanism In the above-described embodiment, the cutter blade C is attached to the transverse shaft 2b of the transverse mechanism 2, but the cutter blade is You may attach to the raising / lowering mechanism 31 like the cutting apparatus shown in FIG.

  Specifically, in the cutting apparatus shown in FIG. 2, the cutter bracket 31 a that supports the cutter blade C is attached to the lifting shaft 31 b of the lifting mechanism 31, and the support member 21 a that supports the lifting shaft 31 b is the transverse mechanism 21. It is slidably supported on the transverse shaft 21b.

  Even when the cutting device having such a structure is used, the cutter blade C can be moved simultaneously in the two axial directions of the horizontal direction and the vertical direction. Roughness of the cut surface can be prevented.

(2) Heater moving mechanism As a result of further examination as to whether or not there is room for improvement in the rubber material cutting device, the inventors have come up with the idea of improving the heater for heating the cutter blade.

  Specifically, a general cutting apparatus is provided with a heater that heats the cutter blade in order to make it easy to cut rubber material. I found out.

  Specifically, as one of the methods for heating the cutter blade, there is a method in which a heater is attached to the base of the cutter blade and the cutter blade is cut while being heated by heat conduction. However, if the thermal conductivity of the cutter blade material is low, the cutting edge temperature will not rise sufficiently, or the cutting edge temperature will become uneven, and the cut surface of the rubber material will be rough and the cutter blade will be burdened. It has been found that there is a problem that the service life is shortened by applying.

  There is also a method in which a heater is provided at a standby position away from the cutting position, and the cutter blade is moved to the standby position and pressed directly against the heater during a standby state in which the rubber material is not cut.

  However, when the cutter blade cuts the rubber material, the temperature of the blade tip decreases to 10 to 100 ° C., and therefore it is necessary to reheat to a specified temperature (150 to 200 ° C.) until the next cutting. It was found that when the heater is provided at the standby position, the cutting edge cannot be heated unless the cutter blade is moved to the standby position, so that the standby time until the next cut is started is increased.

  The present inventor considered using a heater having a structure as shown in FIG. 3 in the cutting device according to the above-described embodiment in order to cope with the problems related to these heaters. FIG. 3 is a side view for explaining a heater of a cutting device according to another embodiment of the present invention.

  As shown in FIG. 3, the cutting device according to the present embodiment includes a heater H attached to the cutter moving mechanism 1 and a heater moving mechanism 4 that moves the heater H close to and away from the cutting edge of the cutter blade C. Yes. In addition, the continuous line part in FIG. 3 has shown the state which made the heater H adjoin to the cutter blade C, and has shown the state from which the dashed-two dotted line part was spaced apart.

  Specifically, the heater H is attached to the heater bracket 4a. The heater moving mechanism 4 includes a cylinder 4b for moving the heater bracket 4a and a moving guide 4c.

  And in this Embodiment, since the heater H is attached to the cutter bracket 2a of the cutter moving mechanism 1 via the heater bracket 4a and the movement guide 4c, it is possible to move the heater H together with the cutter blade C. it can.

  The cylinder 4b of the heater moving mechanism 4 has a proximal end hinged to the cutter bracket 2a and a distal end hinged to the heater bracket 4a.

  The moving guide 4c is formed with a heft-shaped guide hole 41c, and the guide pin 41a of the heater bracket 4a is fitted into the guide hole 41c.

  In the case of the heater moving mechanism 4 having such a structure, the heater bracket 4a is moved along the guide hole 41c as shown by the arrow B by extending the rod 41b of the cylinder 4b as shown by the arrow A in FIG. The heater H at the tip of the bracket 4a can be brought close to the cutting edge of the cutter blade C. On the other hand, by contracting the rod 41b of the cylinder 4b as indicated by an arrow C, the heater H can be separated from the cutting edge of the cutter blade C as indicated by an arrow D.

  In the present embodiment, since the heater H can be directly heated by being brought close to the cutting edge of the cutter blade C, the cutting edge of the cutter blade C can be sufficiently heated even if a material having poor heat conduction is used for the cutter blade. At the same time, the temperature of the blade edge can be made uniform. In addition, it is preferable that the distance of the blade edge | tip of the heater H and the cutter blade C at this time shall be 0-10 mm.

  Further, since the heater H is attached to the cutter bracket 2a of the cutter moving mechanism 1 via the heater bracket 4a and the moving guide 4c, the heater H can be moved together with the cutter blade C. Heating can be performed without moving to the standby position, and the standby time can be shortened compared to a method of installing a heater at the standby position.

  In this embodiment, the heater H is configured to be separated from the cutting edge of the cutter blade C, and the heater H is separated from the cutter blade C when the rubber material is cut. Thereby, although the heater H is moved with the cutter blade C, the heater H does not interfere with the cutting operation.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Cutter moving mechanism 2, 21 Traverse mechanism 2a, 31a Cutter bracket 2b, 21b Traverse axis | shaft 3, 31 Lifting mechanism 3a, 21a Supporting member 3b, 31b Lifting axis | shaft 4 Heater moving mechanism 4a Heater bracket 4b Cylinder 4c Movement guide 41a Guide pin 41b Rod 41c Guide hole C, C1, C2 Cutter blade H Heater W Rubber material

Claims (11)

A rubber material cutting device for cutting rubber material while moving a cutter blade,
A rubber material cut comprising a cutter moving mechanism for cutting the rubber material while simultaneously moving the cutter blade whose blade edge is directed to the rubber material in the width direction and the thickness direction of the rubber material. apparatus. The cutter moving mechanism is
A traversing mechanism for moving the cutter blade in the width direction of the rubber material;
An elevating mechanism for moving the cutter blade in the thickness direction of the rubber material,
The rubber material cutting device according to claim 1, wherein the rubber material is cut by simultaneously operating the traversing mechanism and the elevating mechanism.   The rubber material cutting device according to claim 2, wherein the cutter blade is attached to a transverse axis of the transverse mechanism.   The rubber material cutting device according to claim 2, wherein the cutter blade is attached to a lifting shaft of the lifting mechanism.   The rubber material cut according to any one of claims 1 to 4, wherein the cutter blade is inclined so that a cut surface of the rubber material after the cutting has an acute angle with respect to a thickness direction. apparatus. The lifting shaft of the lifting mechanism is inclined with respect to the thickness direction of the rubber material,
5. The structure according to claim 2, wherein the cutter blade is moved so that a cut surface of the rubber material after the cutting has an acute angle with respect to the thickness direction. The rubber material cutting device described in 1.   The rubber material cutting device according to any one of claims 1 to 6, wherein a heater for heating the blade edge of the cutter blade is attached to the cutter moving mechanism. A heater moving mechanism for moving the heater close to or away from the blade edge of the cutter blade;
The heater moving mechanism is configured to directly heat the blade edge by bringing the heater close to the blade edge before cutting the rubber material, and to separate the heater from the blade edge when the rubber material is cut. The rubber material cutting device according to claim 7.   9. The rubber material cutting device according to claim 8, wherein the heater moving mechanism is configured to bring the heater close to a cutting edge of the cutter blade up to a distance of 0 to 10 mm. A rubber material cutting method for cutting a rubber material using the rubber material cutting device according to any one of claims 1 to 9,
A rubber material cutting method, wherein the rubber material is cut while simultaneously moving the cutter blade whose blade edge faces the rubber material in the width direction and the thickness direction of the rubber material.   The rubber material cutting method according to claim 10, wherein the rubber material is cut by lowering the cutter blade in a thickness direction while traversing the cutter blade in one direction along the width direction of the rubber material.

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